Small-size grease gun

ABSTRACT

A small-size grease gun includes a hollow main body, a grease nipple connected to a front end of the main body, a push rod elastically movably disposed in the main body, and a cylindrical grease container screwed to a sleeve vertically extended from a top of the main body. A rear section of the push rod is projected from a rear open end of the main body to connect to a knob. The grease container has a hold-down disc positioned therein and being normally pushed downward by a spring fixed to a lower side of a top cover of the grease container. An amount of grease filled in the grease container is forced into the main body by the hold-down disc. By pushing the rear section of the push rod into the main body, the grease is compressed to inject into a small-size pneumatic tool via the grease nipple.

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a small-size grease gun, andmore particularly to a grease gun specially designed for convenientlyand quickly injecting grease into a small-size pneumatic tool.

[0002] Most of the currently commercially available grease guns aredesigned for greasing a large-scale machine table but not suitable forgreasing small-size pneumatic tools. Therefore, operators of small-sizepneumatic tools often have troubles in maintaining or repairing suchsmall pneumatic tools due to lack of suitable grease guns.

SUMMARY OF THE INVENTION

[0003] A primary object of the present invention is to provide asmall-size grease gun suitable for injecting grease into small-size ballbearings of a pneumatic tool, so that the pneumatic tool could bemaintained in a more convenient and quick manner.

[0004] To achieve the above and other objects, the small-size grease gunof the present invention mainly includes a hollow main body, a greasenipple connected to a front end of the main body with a conical springand a steel ball disposed between them, a push rod elastically movablyassociated with the main body, and a cylindrical grease containerscrewed to a sleeve vertically extended from a top of the main body. Afront section of the push rod is located inside the main body with aspring put thereon, and a rear section of the push rod is projected froma rear open end of the main body to connect to a knob. The greasecontainer has a hold-down disc positioned therein and being normallypushed downward by a spring fixed to a lower side of a top cover of thegrease container. An amount of grease filled in the grease container isforced into the main body by the hold-down disc. By pushing the rearsection of the push rod into the main body, the grease in the main bodyis compressed to inject into a small-size pneumatic tool via the greasenipple.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005] The structure and the technical means adopted by the presentinvention to achieve the above and other objects can be best understoodby referring to the following detailed description of the preferredembodiments and the accompanying drawings, wherein

[0006]FIG. 1 is an assembled perspective view of a small-size grease gunaccording to the present invention;

[0007]FIG. 2 is an exploded perspective view of FIG. 1;

[0008]FIG. 3 is a sectional view of FIG. 1; and

[0009]FIG. 4 shows the manner of using the small-size grease gun of thepresent invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Please refer to FIGS. 1, 2, and 3 at the same time, in which asmall-size grease gun 100 according to the present invention is shown.The small-size grease gun 100, as shown, mainly includes a main body 1in the form of a hollow tubular member, a grease nipple 2 connected to afront end of the main body 1 with a steel ball 11 and a conical spring12 disposed between them, a push rod 3 movably associated with the mainbody 1, and a cylindrical grease container 7 connected to a sleeve 13vertically extended from a top of the main body 1.

[0011] A front section of the push rod 3 is disposed inside the mainbody 1 with a spring 4 put thereon, and a rear section of the push rod 3is projected from a rear open end of the main body 1 while a cap 5 isput around the push rod 3 to close the rear open end of the main body 1.A knob 6 is connected to a rear end of the push rod 3 to enablecomfortable pushing and pulling of the push rod 3 at the knob 6.

[0012] The cylindrical grease container 7 is provided at a lower endwith a locking neck 71 having external threads 711. And, the sleeve 13on the top of the main body 1 is provided with internal threads 131meshing with the external threads 711 to enable firm connection of thegrease container 7 to the sleeve 13 of the main body 1 throughengagement of the external threads 711 with the internal threads 131. Ahold-down disc 8 having an O-ring 81 mounted around an outer peripheraledge thereof is fitly positioned in the cylindrical grease container 7.A top cover 9 is closed onto an upper open end of the grease container 7with a spring 91 fixedly connected to a lower side of the top cover 9 tonormally push the hold-down disc 8 downward in the grease container 7.

[0013] After the small-size grease gun 100 is assembled from theabove-mentioned components with the locking neck 71 of the greasecontainer 7 screwed to the sleeve 13 of the main body 1, an amount ofgrease may be filled into the grease container 7 before the hold-downdisc 8 is disposed into the grease container 7 and the top cover 9 isclosed onto the upper open end of the grease container 7. The spring 91fixed to the lower side of the top cover 9 pushes the hold-down disc 8downward, forcing the grease in the grease container 7 into the mainbody 1 for injection via the grease nipple 2.

[0014] Please refer to FIG. 4 that shows the manner of using thesmall-size grease gun 100 of the present invention. To use the greasegun 100, first fill the grease container 7 with an amount of grease.Allow the spring 91 and the hold-down disc 8 to apply a downwardpressure on the grease and thereby forces the same into the hollow mainbody 1 via the sleeve 13. And then push the knob 6 toward the main body1, so that the rear section of the push rod 3 is moved into the mainbody 1. At this point, the grease in the main body 1 is compressed toinject into a small-size pneumatic tool via the grease nipple 2.

[0015] Due to the small size of the grease gun of the present invention,it is particularly suitable for greasing small-size ball bearings ingeneral pneumatic tools.

What is claimed is:
 1. A small-size grease gun, comprising: a hollowmain body having a conical grease nipple connected to a front endthereof, a sleeve vertically extended from a top of said main body, anda push rod movably associated with said main body; said push rodincluding a front section that is received in a hollow space defined bysaid main body with a first spring put thereon, and a rear section thatis projected from a rear open end of said main body to connect at a rearend to a knob; and a cylindrical grease container having a locking neckportion provided at a lower end thereof for screwing onto said sleeve ofsaid main body; a hold-down disc having an O-ring mounted around anouter peripheral edge thereof being positioned in said grease container,and a top cover having a second spring fixed to a lower side thereofbeing closed onto an upper open end of said grease container, such thatsaid second spring normally pushes said hold-down disc downward; Wherebywhen said hold-down disc is positioned into and said top cover is closedonto said grease container after the latter is filled with an amount ofgrease, said second spring pushes said hold-down disc downward to forcesaid grease into said main body via said sleeve; and when said rearsection of said push rod is pushed into said main body, said grease insaid main body is compressed to inject into a small-size pneumatic toolvia said grease nipple.